package com.hmdp.interceptor;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.lang.Nullable;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {

    private final StringRedisTemplate stringRedisTemplate;
    //这里没把拦截器放到ioc容器所以使用构造方法注入,当然如果拦截器放到ioc里就可以用注解
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean  preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception{
        // 1. 请求头中的token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank( token)){
            // 优化过后不拦截直接放行
//            response.setStatus(401);
            return true;
        }
        // 2. 用token获取redis中的用户
        String key =  RedisConstants.LOGIN_USER_KEY+token;
        Map<Object,Object> userMap = stringRedisTemplate.opsForHash().entries(key);

        //3.判断用户是否存在
        if(userMap.isEmpty()){
            //4.不存在，不拦截，返回401状态码
//            response.setStatus(401);
            // 优化过后不拦截直接放行
            return true;
        }

        // 5. 将 查询到的Hash数据转化为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        // 保存
        UserHolder.saveUser(userDTO);
        // 7. 刷新token有效期
        stringRedisTemplate.expire(key, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        // 8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
